I tried, as an experiment, exporting a sprite from the School Pinball game
http://scratch.mit.edu/projects/kevin_and_abe/54377
that had comment blocks from v1.2beta
Importing that sprite to v1.2.1 caused the pink crash screen.
Since comment blocks are not part of v1.2.1, I can't really claim that this is a bug, but the whole project runs under v1.2.1, so it would be nice if the sprite import/export worked as well.
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I just checked and found out the bug in the CommentBlock code was already there in the v1.2beta, i.e. importing a previously exported commented sprite actually didn't work in that beta-version (funny that nobody noticed this at the time, <chuckle)>.
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